A 3.00 x 10^2-W electric immersion heater is used to heat a cup of water. The cup is made
of glass and its mass is 3.00 x 10^2 g. It con-
tains 250 g of water at 15° C. How much time
is needed for the heater to bring the water to
the boiling point? Assume the temperature of
the cup to be the same as the temperature of
the water at all times and no heat is lost to
the air.